Thanks for the tips!
I guess I should be a bit more liberal with the Curagas.
I'm usually locked onto the tank as main healer, and tend to be more reactionary when I see a Black Mage starting to take damage... but by then it's often too late even with another White Mage healing the rest of the party.
I'll talk with the other WHM and adjust our strategy a bit. It should work in Cutter's Cry as well. I've only been into Aurum Vale a few times and it usually did not end well. ^^;